Miniscule in your pack, the lightweight Speed Light Jacket is made with the new generation of heavy duty, three-layer GORE-TEX Pro fabric redesigned with improved breathability for extreme conditions. Ideal for climbing or mountaineering, the robust shell is completely seam taped and waterproof with the unrestricted mobility of Angel-Wing Movement. It also has our most technical laminated wire brim hood, designed for the most challenging weather environments.

Nice lightweight jacket. Not the lightest out there, but for this quality (triple layer Gore-Tex) probably so. I don't own any less expensive Gore Tex shells to compare to definitively justify the cost- I'm sure it has to do with the Marmot brand, which I trust. Have used it for a few runs, just going out, and enjoyed the feel and kept me dry while allowing my skin to breathe. I plan on stashing it on day hikes and backcountry trips when it might rain more than a drizzle. Will update this if any new developments.